Gas stop-cock.



Patented May l3, I902.

m. a. mum.

GAS SHIP-600K.

(No Model.)

UNTTED STATES ATENT FFICE.

MICHAEL R. (JOLVIN, OF IVOROESTER, MASSACHUSETTS.

GAS STOP-COCK.

SPECIFIUATION forming part Of Letters ZEatent N0. 699,659,.dated May 13, 1902. Application filed August 10, 1900. S rial No. 26,502. (No model.)

To all whom it ntay concern:

Be it known that I, MIoHAEL R. COLVIN, a citizen of the United States, residing at lVorcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Gas Stop-Cocks, of which the following is a specification, accompanied by drawings forming a part of the same, in which- Figure 1 represents a side elevation of a portion of a gas-fixture containing a key embodying my improvement, showing the key closed. Fig. 2 is a central vertical longitudinal view, on a larger scale, of my improved key, showing the 'gasway open. Fig. 3 is a sectional view on line 3 8, Fig. 1, showing the gasway closed. Fig. 4 is a sectional View on line at 4, Fig. 1, looking in the direction of the arrow.

Similar reference-letters refer to similar parts in the different figures.

My invention relates to gas stop-cocks having tapered rotating keys, such as are now employed for opening and closing the passages in gas pipes or fixtures; and it has for its objects to secure greater safety from the leakage of gas when the key is closed and to provide means to take up wear and maintain a close fit of the gas-key when worn from con tinual use. These objects I attain by the construction and arrangement of parts as hereinafter described,- the several features of novelty being pointed out in the annexed claims.

Referring to the drawings, A denotes a gaspipe forming a part of a gas-fixture or wallbracket provided with a tapered opening or hole B, forming a seat for a tapered rotating key 0, fitting the seat B, and having a passageway 0 transversely through the key 0 in alinement with the passage-way A through the pipe A. Upon one side of the pipe A is a flange D, extending nearly half-way around the tapered key 0, with the ends of the flange D arranged to serve as a stop for the projecting end of the pin E and limit the motion of the key to one-half a rotation.

Connecting the ends of the flange D is a bar F, having its upper surface beveled to form cam-surfaces F F at the ends of the bar F next the flange D, so that in case the tapered key 0 becomes loosened in its bearings so as to leak gas the act of closing the key will carry the projecting end of the pin E into contact with one or the other of the beveled surfaces F, which act as cam -surfaces to crowd the tapered key 0 against its seat in the pipe. The tapered key 0 may be held against the seatin the usual manner by means of a circular bolt G and a washer G; but the key is securely held in place by the end of the pin E, which projects into a mortise or slot I-I above the bar F.

The pin E is screw-threaded at E fora portion of its length and fits a screw-threaded hole I in the key 0. The end E of the pin which projects beyond the key is made taper ing, and the upper edge of the bar F is slightly beveled to fit the taper of the end E of the pin E. The entire length of the pin E is preferably equal to the diameter of the key 0 at the hole I to allow the pin to be inserted in the key through the mortise or seat H. The key is then turnedinto the position shown in Fig. 3, and the pin E is advanced by screw ing it into the key until its tapered end E projects into the mortise or slot II and bears against the beveled upper surface of the bar F. These parts are so fitted together that the.

tapered end E of the pin' will bear firmly against the bar F when the key 0 is in close contact with its seat. As the key is turned to close the gasway the end E of the pin is brought against the ends of the flange D and over one of the beveled or cam surfaces F F, which crowds the key closely against its seat, and as the bar F becomes worn the pin is advanced by screwing it farther into the key 0 in order to crowd its tapered end more firmly against the bar F.

hat I claim as my invention, and desire to secure by Letters Patent, is-

1. In a gas stop-cock, comprising a tapered rotating key having a tapered seat fitting the key, the combination with the tapered rotating key of a pin having a tapered end projecting from the key, a fixed bar arranged to bear against the tapered end of said pin, and means for advancing said pin endwisein order to compensate for wear, substantially as described.

2. In a gas stop-cock, the combination of a pipe having a tapered seat, a tapered rotating key fitting said seat and having a transverse screw-threaded hole, a screw-threaded pin held in said transverse hole and having a tapered end projecting beyond the periphery of the key, said pipe having a surface arranged to bear against the tapered end of the pin, whereby said key is crowded against its seat by advancing said screw-threaded pin in the key, substantially as described.

3. The combination of a rotary plug-valve,

a body in which said valve is fitted to seat and turn, an inclined cam-face formed on the eX- terior of the valve-body adjacent to one end of the valve-seat, in position to limit the traverse of the valve in one direction,and a locking device connected to the valve and adapted to permit free movement thereof through- 'WVitnesses:

RUFUS B. FOWLER, M. 0. PRICE. 

